Selective leaching of Mo from an off-grade gravity lead concentrate in Na2CO3 solution

J. Min. Metall. Sect. B-Metall. 55 (2) B (2019) 253-259. DOI:10.2298/JMMB181128027L
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Abstract

The selective leaching of Mo from an off-grade gravity lead concentrate was investigated in Na2CO3 solution using air as an oxidant. The leaching behaviors of Mo and Pb were predicted by the thermodynamic phase diagrams of Pb-Mo-C-H2O system. The oxidation mechanisms of those sulfides in the off-grade gravity lead concentrate were confirmed by the methods of X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS). The influence of operating factors on the leaching behaviors of Mo and Pb, including Na2CO3 concentration, liquid-to-solid ratio, temperature, and leaching time, were studied. Under these optimum leaching conditions (Na2CO3 2 M, leaching time 8 h, temperature 75 oC, air-flow rate 2.0 m3/h and L/S ratio of 10/1 mL/g), the extraction of Mo and Pb was up to 97.70 and 0.73 %, respectively.
Keywords: Gravity lead concentrate; Molybdenite; Selective leaching; Air oxidation; Na2CO3
Correspondence Address:
Z.-X. Liu, The Collaborative Innovation Center of
Manganese-Zinc-Vanadium Industrial Technology,
Jishou University, Jishou, PR China
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